Casey Affleck got into fighting shape to play an Iraq combat vet in “Out of the Furnace.” “I was not someone you would see walking down the street and say, ‘That is a man who can kick some ass,’ ” he told us during a Peggy Siegal lunch hosted by Robert Duvall at the Explorers Club Wednesday. Affleck trained with former heavyweight and US Olympic boxer John Bray. “Luckily, I didn’t have to look like Muhammad Ali or anything. It’s not ‘Bourne Identity’ fighting. It’s not very polished or slick,” he said. “I can kick [director] Scott [Cooper’s] ass. I have been in maybe one or two fights in my life, but most of them were in the ’80s.” Cooper, who also directed “Crazy Heart,” applauded Affleck’s dedication and stuck up for “Furnace” co-star Christian Bale, saying he’s nothing like the man heard on the profanity-laced tape leaked from“Terminator: Salvation.” “The person who released that, and I’ll say this on the record, is a coward,” Cooper said.